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sAMUnn MceoRMioK. or DUBLIN, IRELAND.

IMPRESSING rnminns UPON scnnw-BILANXS.

Specification of Letters Patent No, 11,004, dated .Tune 6, 1854.

To all whom t may concern.'

Be it known that I, SAMUEL MCCORMICK, of Fleet street, in the city of Dublin, in the Kingdom of Ireland, engineer, have invented Improvements in Machinery for Forming ScrewThreads, Moldings, and Ornaments on Metal; and I d0 hereby declare that the following, reference being had to the drawings accompanying the specifica tions, is a full and exact description thereof.

This invention consists in forming or impressing screw threads or ornaments on the plain surface of screw blanks or other plain shafts of metal by means of three revolvingdies arranged adjusted and set in motion so as to act upon the said plain surfaces in the manner hereinafter described.

Figure 15 is a side elevation. Fig, 16 a plan. Fig. 17 a front elevation and Fig. 1S a section through the line X, X of Fig. 15.

A A is the frame work or standards of the machine; B, B, fast and loose pulleys actuated by any prime mover.

C, is a toothed pinion gearing with the wheel D.

E 4is a case of metal fixed on the shaft F and containingthe wheel G with teeth on the inner circumference as shown detached and full size, or nearly full size at Fig. 19.

l, 2. 3 are pinions which drive the die spindles 4, 5, 6, shown in Fig. 18. These spindles are supported on pedestals I, I, in which also the shaft Fis mounted. One of these spindles with its die is shown separately to an enlarged scale in Fig. 20.

7, S, 9 are dies having formed upon them in reverse the screw thread or ornament to be impressed on the bolt or article under operation.

K is a rod for communicating an upward and downward motion by the revolution of the cam N, (see Fig. 1-7) to the lever L which is connected vwith and transmits the same motion to the upper spindle 4, and its die.

O is the cam shaft which also carries the wheel P taking into the `pinion P which pinion may be connected with a system of change wheels (which are well known) so as to vary the speed, and'adapted to different kinds of screw threads or ornaments; when the speed is increased the length of the thread or ornamentl is decreased when the speed is diminished the length of the thread or ornament is increased.

Q and Q2 are conical drums the taper in one of which is placed reversely to that in the other.;`the small drum Q driving the larger drum Q2 by means of a strap or band in the usual well known manner. The speed can also be altered by moving the band on these drums.

The action of this mechanism is as follows: The three die spindles 4, 5, 6, are set in motion simultaneously by the wheel Gr taking into the three pinions (each having the same number of teeth) on their ends. These three spindles carry three dies 7, 8, 9, which have formed upon them in reverse the screw thread or ornament to be impressed on the bolt or plain shaft introduced between them, and by introducing the article to be operated upon between these dies, the screw thread or ornament will become impressed upon its plain surface. By the revolution of the cam N Jthe lever L and the uppermost spindle and its die are raised through the medium 0f the connecting rod K and it is during this time that the bolt or screw-blank is introduced in the` central space beneath the uppermost die; by the combined revolution of the cam N the uppermost` die is immediately and forcibly depressed on to the article under operation by which depression the article or bolt is forced into the interstices of the revolving dies which by their revolution impress a screw-thread or molding on the surface of the said article or bolt. 0n or before the next opening` of the dies the article either falls out of itself or is forced out by the revolution of the dies or is remo-ved by the attendant.

f it be desired to impress a screw thread on a. bolt or screw blank the revolving dies are cut into a screw thread of the required pitch and shape in reverse, if for a right hand screw they require to be cut left hand and vice versa, also the dies require to be placed out of parallel with cach other to such an extent as that the angle of the thread on the revolving dies may coincide with the angle of the thread on the bolt If it is desired to impress a circular ornament, the spindles are placed parallel to each other; attention must be given to placing the dies and their spindles so that the corresponding part of the design shall agree with each other when acting.

The materials of the dies, may be cast iron or steel, or steel and iron combined or iron case hardened.

I would here remark that I do not limit myself'to the mode described of revolving the dies, regulating the speed and other details so long as the peculiar character of my 5 invention be retained, which is the placing v ofthe three revolving dies triangularly, and

causingthem to revolve simultaneously forV the purposes described the uppermost die being raised and depressed at short inter- .V 10 vals by suitable mechanism. But

What I claim as of my invention is- 'Ihe lforming or impressing of screwthreads or ornaments on the plain surface of screw blanks or other plain shafts of metal by means of three revolving dies 15 placed triangularly on a 4suitable frame and Worked by mechanism as described (or by the mechanical equivalents thereof) s0 as to produce the results described.

7 th February, 1864.

SAMUEL MGCORMICK. Witnesses: y

BENJ. I. TILFORD, SAML. MCCORMIGK, Jr, 

